CN203859678U - Switching power supply of photovoltaic grid-connected inverter - Google Patents
Switching power supply of photovoltaic grid-connected inverter Download PDFInfo
- Publication number
- CN203859678U CN203859678U CN201420284824.1U CN201420284824U CN203859678U CN 203859678 U CN203859678 U CN 203859678U CN 201420284824 U CN201420284824 U CN 201420284824U CN 203859678 U CN203859678 U CN 203859678U
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- Prior art keywords
- resistance
- power supply
- electric capacity
- transformer
- pwm controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model discloses a switching power supply of a photovoltaic grid-connected inverter. The switching power supply comprises a transformer T1 and a PWM controller. An anode of a primary winding of the transformer T1 is connected with a power supply through a filtering circuit. Input ends of the PWM controller are respectively connected with a sampling circuit and the anode of the primary winding of the transformer T1. An output end of the PWM controller is connected with a cathode of the primary winding of the transformer T1 through a field effect transistor Q1. B-H secondary windings of the transformer T1 are respectively connected with a driving circuit of the inverter, a relay and a fan, a DSP chip power supply end, an ARM chip power supply end, a first 485 communication interface, a second 485 communication interface and a CAN communication interface through a rectification filtering circuit. A feedback end of the PWM controller is connected to the DSP chip power supply end through a feedback circuit. According to the utility model, the switching power supply is arranged individually, and a certain distance is maintained between each part of the inverter and the switching power supply, so that interference is avoided, and the stability of the inverter is improved.
Description
Technical field
The utility model relates to grid-connected technical field, is specifically related to a kind of Switching Power Supply of photovoltaic combining inverter.
Background technology
Solar energy power generating is to rely on solar module, utilizes the electronics property of semi-conducting material, and light energy conversion is become to electric energy.Grid-connected system becomes receive the solar radiation energy coming into high voltage direct current by photovoltaic array after high-frequency direct-current is changed, through the backward electrical network output of inverter inversion and the simple sinusoidal alternating current of line voltage with frequency, homophase; Must keep inverter in stable operating state, just can guarantee that the high voltage direct current inversion that photovoltaic array is produced is available simple sinusoidal alternating current, the stable working state of inverter need to be considered many factors, and wherein the power supply of inverter is a very important factor.
The inverter of the grid-connected use of 6KW needs respectively its drive circuit, relay and fan, power supply sample circuit, dsp chip, ARM chip, two 485 communication interfaces, CAN communication interfaces to be powered, and the current Switching Power Supply not being specifically designed to as each link power supply of inverter, the measure adopting is that power circuit is set respectively respectively on the circuit board of each link, and the electromagnetic interference that power circuit produces easily affects the stability of each link.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of Switching Power Supply of photovoltaic combining inverter, can solve current 6KW photovoltaic combining inverter power circuit is set respectively on the circuit board of each link, the electromagnetic interference that causes power circuit to produce easily affects the problem of the stability of each link.
The utility model is achieved through the following technical solutions:
A kind of Switching Power Supply of photovoltaic combining inverter, comprise transformer T1, also comprise PWM controller, the armature winding positive pole of described transformer T1 connects power supply by filter circuit, the input of described PWM controller connects respectively the armature winding positive pole of sample circuit and transformer T1, described PWM controller output end is connected in the armature winding negative pole of transformer T1 by field effect transistor Q1, B ~ H secondary winding of described transformer T1 connects respectively the drive circuit of inverter by current rectifying and wave filtering circuit, relay and fan, dsp chip power end, ARM chip power end, the one 485 communication interface, the 2 485 communication interface and CAN communication interface, the feedback end of described PWM controller is connected in dsp chip power end by feedback circuit.
Described sample circuit comprises the A secondary winding that carries out being connected in after twice rectifying and wave-filtering the transformer T1 of PWM controller input by D9 diode, C41 electric capacity and D10 diode, C42 electric capacity, and one end is connected to D11 voltage stabilizing didoe and the C43 electric capacity of PWM controller input, other end ground connection.
Described filter circuit comprises the ZR1 piezo-resistance that is parallel to two poles, and the 8th resistance R 8 and the C8 high pressure ceramic disc capacitor that after series connection, are parallel to piezo-resistance ZR1 two ends, described C8 high pressure ceramic disc capacitor two ends are parallel with C9 electric capacity and the C10 electric capacity of series connection, described C9 electric capacity and C10 electric capacity two ends are parallel with respectively R9 resistance and R10 resistance, and the common port of described R8 resistance and C8 high pressure ceramic disc capacitor is connected sample circuit by the R11 resistance of series connection with R12 resistance.
Described feedback circuit comprises that output is connected in the opto-coupler chip U3 of PWM controller feedback end by C4 electric capacity, the input anode of described opto-coupler chip U3 connects dsp chip power end by R4 resistance respectively, the 4th pin REF that connects voltage comparator U2 by C7 electric capacity, by C6 electric capacity, connect negative pole, the input cathode of described opto-coupler chip U3 connects the 3rd pin CA of voltage comparator U2, the 5th pin AN of described voltage comparator U2 is by the R5 resistance of series connection, R6 resistance connects dsp chip power end, the common port of R5 resistance and R6 resistance is connected the 4th pin REF of voltage comparator U2 by R7 resistance.
The utility model advantage is compared with prior art:
One, Switching Power Supply is arranged separately, be convenient to maintain a certain distance to avoid to produce interference with each link of inverter, improve the stability of invertor operation;
Two, the structure of each link of inverter is more directly perceived, and system configuration is more clear, and wiring is very convenient.
Accompanying drawing explanation
Fig. 1 is A, the D secondary winding circuit diagram of PWM controller and transformer T1.
Fig. 2 is the B secondary winding circuit diagram of transformer T1.
Fig. 3 is the C secondary winding circuit diagram of transformer T1.
Fig. 4 is the E secondary winding circuit diagram of transformer T1.
Fig. 5 is the F secondary winding circuit diagram of transformer T1.
Fig. 6 is the G secondary winding circuit diagram of transformer T1.
Fig. 7 is the H secondary winding circuit diagram of transformer T1.
Embodiment
The Switching Power Supply of a kind of photovoltaic combining inverter as shown in Figure 1, comprise transformer T1, also comprise PWM controller 1, the model of described PWM controller 1 is UC2845A, the armature winding of described transformer T1 is anodal by filter circuit 3 connection power supplys, the input of described PWM controller 1 connects respectively the armature winding positive pole of sample circuit 2 and transformer T1, described PWM controller 1 output is connected in the armature winding negative pole of transformer T1 by field effect transistor Q1, B ~ H secondary winding of described transformer T1 connects respectively the drive circuit of inverter by current rectifying and wave filtering circuit, relay and fan, dsp chip power end, ARM chip power end, the one 485 communication interface, the 2 485 communication interface and CAN communication interface, the feedback end of described PWM controller 1 is connected in dsp chip power end by feedback circuit 4.
Described sample circuit 2 comprises the A secondary winding that carries out being connected in after twice rectifying and wave-filtering the transformer T1 of PWM controller 1 input by D9 diode, C41 electric capacity and D10 diode, C42 electric capacity, and one end is connected to D11 voltage stabilizing didoe and the C43 electric capacity of PWM controller 1 input, other end ground connection.Consider that sample circuit 2 does not add voltage stabilizing chip, Possible waves is larger, therefore at voltage output end, has added a D11 voltage stabilizing didoe.
Described filter circuit 3 comprises the ZR1 piezo-resistance that is parallel to two poles, and the 8th resistance R 8 and the C8 high pressure ceramic disc capacitor that after series connection, are parallel to piezo-resistance ZR1 two ends, described C8 high pressure ceramic disc capacitor two ends are parallel with C9 electric capacity and the C10 electric capacity of series connection, described C9 electric capacity and C10 electric capacity two ends are parallel with respectively R9 resistance and R10 resistance, and the common port of described R8 resistance and C8 high pressure ceramic disc capacitor is connected sample circuit 2 by the R11 resistance of series connection with R12 resistance.Due to power supply input, getting the direct current of cell panel inputs, therefore this Switching Power Supply design is compared and has been saved rectification link with traditional switch power supply, consider the input voltage of solar panel, the feature that current ripples is less, therefore at direct-flow input end, saved filter inductance, only need add a C8 high pressure ceramic disc capacitor carries out filtering, consider the feature of the wide dynamic range of solar panel, therefore filtering capacitance of voltage regulation adopts C9 electric capacity and C10 capacitances in series, for low power power electronic equipment, when adopting capacitances in series technology, conventionally do not need parallel resistance, but consider the stability of system, this design is respectively at C9 electric capacity and C10 electric capacity two ends R9 resistance in parallel and R10 resistance.
Described feedback circuit 4 comprises that output is connected in the opto-coupler chip U3 of PWM controller 1 feedback end by C4 electric capacity, the input anode of described opto-coupler chip U3 connects dsp chip power end by R4 resistance respectively, the 4th pin REF that connects voltage comparator U2 by C7 electric capacity, by C6 electric capacity, connect negative pole, the input cathode of described opto-coupler chip U3 connects the 3rd pin CA of voltage comparator U2, the 5th pin AN of described voltage comparator U2 is by the R5 resistance of series connection, R6 resistance connects dsp chip power end, the common port of R5 resistance and R6 resistance is connected the 4th pin REF of voltage comparator U2 by R7 resistance, opto-coupler chip U3 and voltage comparator U2 isolate feedback signal respectively and nurse one's health.The feature that needs feedback signal according to UC2845A, selects to gather feedback signal from dsp chip power end, because after the normal work of system, DSP part power source loads keeps constant substantially, is conducive to the stability of whole Switching Power Supply design.
The drive circuit of inverter adopts two to drive chip, so the B secondary winding of transformer T1 comprises respectively B1 secondary winding and B2 secondary winding, is respectively two and drives chip power supply.
Claims (4)
1. the Switching Power Supply of a photovoltaic combining inverter, comprise transformer T1, it is characterized in that: also comprise PWM controller (1), the armature winding of described transformer T1 is anodal by filter circuit (3) connection power supply, the input of described PWM controller (1) connects respectively the armature winding positive pole of sample circuit (2) and transformer T1, described PWM controller (1) output is connected in the armature winding negative pole of transformer T1 by field effect transistor Q1, B ~ H secondary winding of described transformer T1 connects respectively the drive circuit of inverter by current rectifying and wave filtering circuit, relay and fan, dsp chip power end, ARM chip power end, the one 485 communication interface, the 2 485 communication interface and CAN communication interface, the feedback end of described PWM controller (1) is connected in dsp chip power end by feedback circuit (4).
2. the Switching Power Supply of a kind of photovoltaic combining inverter as claimed in claim 1, it is characterized in that: described sample circuit (2) comprises the A secondary winding that carries out being connected in after twice rectifying and wave-filtering the transformer T1 of PWM controller (1) input by D9 diode, C41 electric capacity and D10 diode, C42 electric capacity, and one end is connected to D11 voltage stabilizing didoe and the C43 electric capacity of PWM controller (1) input, other end ground connection.
3. the Switching Power Supply of a kind of photovoltaic combining inverter as claimed in claim 1, it is characterized in that: described filter circuit (3) comprises the ZR1 piezo-resistance that is parallel to two poles, and the 8th resistance R 8 and the C8 high pressure ceramic disc capacitor that after series connection, are parallel to piezo-resistance ZR1 two ends, described C8 high pressure ceramic disc capacitor two ends are parallel with C9 electric capacity and the C10 electric capacity of series connection, described C9 electric capacity and C10 electric capacity two ends are parallel with respectively R9 resistance and R10 resistance, the common port of described R8 resistance and C8 high pressure ceramic disc capacitor is connected sample circuit (2) by the R11 resistance of series connection with R12 resistance.
4. the Switching Power Supply of a kind of photovoltaic combining inverter as claimed in claim 1, it is characterized in that: described feedback circuit (4) comprises that output is connected in the opto-coupler chip U3 of PWM controller (1) feedback end by C4 electric capacity, the input anode of described opto-coupler chip U3 connects dsp chip power end by R4 resistance respectively, the 4th pin REF that connects voltage comparator U2 by C7 electric capacity, by C6 electric capacity, connect negative pole, the input cathode of described opto-coupler chip U3 connects the 3rd pin CA of voltage comparator U2, the 5th pin AN of described voltage comparator U2 is by the R5 resistance of series connection, R6 resistance connects dsp chip power end, the common port of R5 resistance and R6 resistance is connected the 4th pin REF of voltage comparator U2 by R7 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420284824.1U CN203859678U (en) | 2014-05-30 | 2014-05-30 | Switching power supply of photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420284824.1U CN203859678U (en) | 2014-05-30 | 2014-05-30 | Switching power supply of photovoltaic grid-connected inverter |
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| Publication Number | Publication Date |
|---|---|
| CN203859678U true CN203859678U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420284824.1U Expired - Fee Related CN203859678U (en) | 2014-05-30 | 2014-05-30 | Switching power supply of photovoltaic grid-connected inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685213A (en) * | 2017-01-13 | 2017-05-17 | 成都中科慧源科技有限公司 | Anti-high voltage interference circuit |
| CN109586390A (en) * | 2019-01-25 | 2019-04-05 | 深圳流量链科技有限公司 | Power circuit and electrical equipment |
-
2014
- 2014-05-30 CN CN201420284824.1U patent/CN203859678U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685213A (en) * | 2017-01-13 | 2017-05-17 | 成都中科慧源科技有限公司 | Anti-high voltage interference circuit |
| CN109586390A (en) * | 2019-01-25 | 2019-04-05 | 深圳流量链科技有限公司 | Power circuit and electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141001 Termination date: 20150530 |
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| EXPY | Termination of patent right or utility model |